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Latest commit

ui/analogipt.cpp: Fixed bar graph display for fields with ranges
that wrap through zero.

emu/inputdev.cpp: Separateed analog axis deadzone and switch threshold
settings, reduced default deadzone, and fixed a potential division by
zero if the deadzone and saturation settings are equal.

emu/ioport.cpp: Fixed behaviour of absolute analog fields where range
passes through zero - it previously only worked for specific
combinations of mask, minimum and default.  Removed a workaround from
universal/getaway.cpp that is no longer necessary.

emu/input.cpp: Fixed unintuitive behaviour when an absolute field is
assigned an OR combination of a relative control folled by an absolute
control (e.g. Mouse X or Joy 1 LSX).  Also fixed reading axis input
sequences where an axis code is followed by a switch code (these can
only be produced by manually editing configuration files, not through
MAME's UI), and fixed the returned type when multiple relative axes sum
to zero.

osd/modules/input_dinput.cpp: Fixed hat switches being stuck in up
position when input is suspended in the background

taito/taitoio_yoke.cpp: Give throttle control a distinct type, and don't

osd: Added option to select MIDI provider module (currently only
PortMidi and the dummy module are available).  Also put various things
in namespaces, and fixed builds including SDL sound module with native
Windows OSD.

emu/validity.cpp: Added check to catch I/O port fields using UI input

emu/inpttype.ipp: Renamed inputs that were causing confusion.  "Bill"
and "Track" were causing confusion for translators and hence likely
causing confusion for many users, especially those who are not native
English speakers.  "Track" as an abbreviation for "Trackball" was
frequently being mistranslated, e.g. in the sense of a CD track
selection button or even in the sense of a railway track.  There's no
reason to abbreviate it.  "Bill" in the US English sense as a banknote
is too ambiguous and was causing confusion for translators.  It's better
to use the less ambiguous "Banknote".  Corrected Greek translations of

Don't run GitHub Actions on issue template changes.
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Build status:

OS/Compiler Status
Linux/GCC and clang CI (Linux)
Windows/MinGW GCC CI (Windows)
macOS/clang CI (macOS)
UI Translations Compile UI translations
Documentation Build documentation

Static analysis status for entire build (except for third-party parts of project):

Coverity Scan Status

What is MAME?

MAME is a multi-purpose emulation framework.

MAME's purpose is to preserve decades of software history. As electronic technology continues to rush forward, MAME prevents this important "vintage" software from being lost and forgotten. This is achieved by documenting the hardware and how it functions. The source code to MAME serves as this documentation. The fact that the software is usable serves primarily to validate the accuracy of the documentation (how else can you prove that you have recreated the hardware faithfully?). Over time, MAME (originally stood for Multiple Arcade Machine Emulator) absorbed the sister-project MESS (Multi Emulator Super System), so MAME now documents a wide variety of (mostly vintage) computers, video game consoles and calculators, in addition to the arcade video games that were its initial focus.

How to compile?

If you're on a UNIX-like system (including Linux and macOS), it could be as easy as typing


for a MAME build,

make SUBTARGET=arcade

for an arcade-only build, or

make SUBTARGET=mess

for a MESS build.

See the Compiling MAME page on our documentation site for more information, including prerequisites for macOS and popular Linux distributions.

For recent versions of macOS you need to install Xcode including command-line tools and SDL 2.0.

For Windows users, we provide a ready-made build environment based on MinGW-w64.

Visual Studio builds are also possible, but you still need build environment based on MinGW-w64. In order to generate solution and project files just run:

make vs2019

or use this command to build it directly using msbuild

make vs2019 MSBUILD=1

Where can I find out more?


Coding standard

MAME source code should be viewed and edited with your editor set to use four spaces per tab. Tabs are used for initial indentation of lines, with one tab used per indentation level. Spaces are used for other alignment within a line.

Some parts of the code follow Allman style; some parts of the code follow K&R style -- mostly depending on who wrote the original version. Above all else, be consistent with what you modify, and keep whitespace changes to a minimum when modifying existing source. For new code, the majority tends to prefer Allman style, so if you don't care much, use that.

All contributors need to either add a standard header for license info (on new files) or inform us of their wishes regarding which of the following licenses they would like their code to be made available under: the BSD-3-Clause license, the LGPL-2.1, or the GPL-2.0.

See more specific C++ Coding Guidelines on our documentation web site.


The MAME project as a whole is made available under the terms of the GNU General Public License, version 2 or later (GPL-2.0+), since it contains code made available under multiple GPL-compatible licenses. A great majority of the source files (over 90% including core files) are made available under the terms of the 3-clause BSD License, and we would encourage new contributors to make their contributions available under the terms of this license.

Please note that MAME is a registered trademark of Gregory Ember, and permission is required to use the "MAME" name, logo, or wordmark.

Copyright (C) 1997-2021  MAMEDev and contributors

This program is free software; you can redistribute it and/or modify it
under the terms of the GNU General Public License version 2, as provided in

This program is distributed in the hope that it will be useful, but WITHOUT
ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
more details.

Please see COPYING for more details.